<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
</head>
<body>
	<script>
		// 1,1,2,3,5,8,13,21....
		// 这个数字前两位是1，从第三位开始每一项都是前两位的和
		
		function fbnq(n){
			if(n == 1 || n == 2){
				return 1;
			}else{
				return fbnq(n-1) + fbnq(n-2);
			}
		}
		console.log(fbnq(25));

	</script>
</body>
</html>



